<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
	#dog{
		margin: 100px;
		position: relative;
	}
</style>
<script type="text/javascript">
	window.onload = function(){
		var dog = document.getElementById('dog');
		dog.onclick = function(e){
			// alert('你好啊~汪汪~~~');
			var ev = window.event || e;//获得事件对象
			// alert(ev.clientX)
			var re = ev.offsetX ||  ev.layerX;//获得鼠标距离事件源左侧的距离
			alert(re);
		}
	}
</script>
</head>

<body>

<img src="dog.jpg" id="dog" />



</body>
</html>
